Computer simulation of investment casting is not an easy process to control, especially considering the material and process variables, the many interrelations and the sources for defect generation. But it can be a tool to improve our understanding of the process and give us, for example, an insight into metal flow during filling as well as temperature profiles of metal and investment material, especially during the cooling and solidification of the metal. Conclusions about avoiding defects, particularly shrinkage porosity, could be expected from this first sample modeling. The aim of this paper is to demonstrate the capabilities and limitations offered by the first sample modeling.